Process to Join JEDEC Chip Carriers to MLC
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
This article describes techniques for joining chip carriers to multilayer ceramic (MLC) substrates and for reworking such chip carriers. Briefly, the technique for joining the chip carriers to the substrate uses a two-step paste deposition process and a double reflow step process at higher than conventional temperatures. The rework techniques include the use of an aluminum block to provide localized heating prior to removal of a defective carrier and the step of screening solder paste onto the bottom of new chip carriers under certain conditions instead of onto the substrate.